흰쥐에서 키토올리고당의 장 생태와 지질 상태에 미치는 용량에 따른 효과

This study was carried out to investigate the dose-response of chitooligosaccharide (with a molecular weight of 1~3 kDa) on antimicrobial activity and lipid lowering functions in rats. Sprague-Dawley male rats were given experimental diets containing 0 (control), 0.5, 2, or 5% chitooligosaccharide (...

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Published inHan'guk Sikp'um Yŏngyang Kwahakhoe chi Vol. 42; no. 4; pp. 563 - 569
Main Authors 김연록(Yeon-Rok Kim), 최영선(Young-Sun Choi)
Format Journal Article
LanguageKorean
Published 한국식품영양과학회 2013
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ISSN1226-3311
2288-5978

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Abstract This study was carried out to investigate the dose-response of chitooligosaccharide (with a molecular weight of 1~3 kDa) on antimicrobial activity and lipid lowering functions in rats. Sprague-Dawley male rats were given experimental diets containing 0 (control), 0.5, 2, or 5% chitooligosaccharide (COS) for 5 weeks. Weight gain and food intake were significantly lower in rats fed 5% COS than control rats and rats fed 0.5 and 2% COS. The numbers of fecal bacteria, including bifidobacteria, lactobacilli, bacteroides, total anaerobes, and total aerobes, which reflect gut microbiota, were significantly decreased in rats fed 5% COS. Plasma triglyceride concentrations significantly decreased in a dose-dependent manner in rats fed 2% or 5% COS, while plasma total cholesterol was not significantly different among groups. The hepatic concentration of triglycerides was lower in rats fed 5% COS, and fecal triglycerides significantly increased in rats fed 5% COS. These results indicate that 5% COS supplementation in a diet may exert antimicrobial activity in vivo, and inhibit the proliferation of typical gut microbes, while lowering lipids. 본 연구는 흰쥐에서 저분자량(1~3 kDa) 키토올리고당(chitooligosaccharide, COS)이 장내 미생물에 미치는 항균활성과 지질 개선에 관한 용량-반응 효과를 조사하기 위하여 수행되었다. 4주령 된 Sprague-Dawley 수컷 32마리를 1주일 동안 사육 환경에 적응시킨 후 군당 8마리씩 4군으로 나누어서 고지방식이에 키토올리고당을 0%(대조식이), 0.5%, 2%, 5% 수준으로 첨가한 식이를 5주 동안 자유롭게 급여하였다. 실험식이 5주째에 장 통과시간을 측정하였고, 신선한 분변을 취하여 장내 균수를 측정하였으며, 희생 후 혈장 지질, 간 지질, GPT 활성, 분변 지질을 측정하였다. 체중 증가량과 식이섭취량은 COS 5% 첨가군에서 유의하게 낮았다. 분변 중 bifidobacteria, lactobacilli, bacteroides, total anaerobes, total aerobes 수는 대조군, COS 0.5% 첨가군과 COS 2% 첨가군 사이에 차이가 없었으나, COS 5% 첨가군에서는 모두 유의하게 감소하였다. 혈장 총 콜레스테롤, HDL-C 및 LDL-C 농도는 군간 차이가 없었으나, 중성지방 농도는 COS 2% 첨가군과 COS 5% 첨가군에서 유의하게 낮았으며, 키토올리고당의 용량이 높아질수록 낮았다. 간 조직의 중성지방 농도는 COS 5% 첨가군에서 낮았으며, 반면에 분변의 콜레스테롤 및 중성지방 농도는 COS 5% 첨가군에서 높았으나 담즙산은 차이가 없었다. 결론적으로 저분자량(1~3 kDa) 키토올리고당을 5% 첨가한 식이는 흰쥐의 식이섭취량, 체중증가량, 혈장 중성지방을 낮추어 지질 개선효과를 보였고, 분변의 혐기성균 중에 bacteroides의 균수를 크게 감소시켰으며 bifidobacteria와 lactobacilli 균수도 억제함으로써 장 미생물생태 변화를 초래하였다.
AbstractList This study was carried out to investigate the dose-response of chitooligosaccharide (with a molecular weight of 1~3 kDa) on antimicrobial activity and lipid lowering functions in rats. Sprague-Dawley male rats were given experimental diets containing 0 (control), 0.5, 2, or 5% chitooligosaccharide (COS) for 5 weeks. Weight gain and food intake were significantly lower in rats fed 5% COS than control rats and rats fed 0.5 and 2% COS. The numbers of fecal bacteria, including bifidobacteria, lactobacilli, bacteroides, total anaerobes, and total aerobes, which reflect gut microbiota, were significantly decreased in rats fed 5% COS. Plasma triglyceride concentrations significantly decreased in a dose-dependent manner in rats fed 2% or 5% COS, while plasma total cholesterol was not significantly different among groups. The hepatic concentration of triglycerides was lower in rats fed 5% COS, and fecal triglycerides significantly increased in rats fed 5% COS. These results indicate that 5% COS supplementation in a diet may exert antimicrobial activity in vivo, and inhibit the proliferation of typical gut microbes, while lowering lipids. 본 연구는 흰쥐에서 저분자량(1~3 kDa) 키토올리고당(chitooligosaccharide, COS)이 장내 미생물에 미치는 항균활성과 지질 개선에 관한 용량-반응 효과를 조사하기 위하여 수행되었다. 4주령 된 Sprague-Dawley 수컷 32마리를 1주일 동안 사육 환경에 적응시킨 후 군당 8마리씩 4군으로 나누어서 고지방식이에 키토올리고당을 0%(대조식이), 0.5%, 2%, 5% 수준으로 첨가한 식이를 5주 동안 자유롭게 급여하였다. 실험식이 5주째에 장 통과시간을 측정하였고, 신선한 분변을 취하여 장내 균수를 측정하였으며, 희생 후 혈장 지질, 간 지질, GPT 활성, 분변 지질을 측정하였다. 체중 증가량과 식이섭취량은 COS 5% 첨가군에서 유의하게 낮았다. 분변 중 bifidobacteria, lactobacilli, bacteroides, total anaerobes, total aerobes 수는 대조군, COS 0.5% 첨가군과 COS 2% 첨가군 사이에 차이가 없었으나, COS 5% 첨가군에서는 모두 유의하게 감소하였다. 혈장 총 콜레스테롤, HDL-C 및 LDL-C 농도는 군간 차이가 없었으나, 중성지방 농도는 COS 2% 첨가군과 COS 5% 첨가군에서 유의하게 낮았으며, 키토올리고당의 용량이 높아질수록 낮았다. 간 조직의 중성지방 농도는 COS 5% 첨가군에서 낮았으며, 반면에 분변의 콜레스테롤 및 중성지방 농도는 COS 5% 첨가군에서 높았으나 담즙산은 차이가 없었다. 결론적으로 저분자량(1~3 kDa) 키토올리고당을 5% 첨가한 식이는 흰쥐의 식이섭취량, 체중증가량, 혈장 중성지방을 낮추어 지질 개선효과를 보였고, 분변의 혐기성균 중에 bacteroides의 균수를 크게 감소시켰으며 bifidobacteria와 lactobacilli 균수도 억제함으로써 장 미생물생태 변화를 초래하였다.
This study was carried out to investigate the dose-response of chitooligosaccharide (with a molecular weight of 1~3 kDa) on antimicrobial activity and lipid lowering functions in rats. Sprague-Dawley male rats were given experimental diets containing 0 (control), 0.5, 2, or 5% chitooligosaccharide (COS) for 5 weeks. Weight gain and food intake were significantly lower in rats fed 5% COS than control rats and rats fed 0.5 and 2% COS. The numbers of fecal bacteria, including bifidobacteria, lactobacilli, bacteroides, total anaerobes, and total aerobes, which reflect gut microbiota, were significantly decreased in rats fed 5% COS. Plasma triglyceride concentrations significantly decreased in a dose-dependent manner in rats fed 2% or 5% COS, while plasma total cholesterol was not significantly different among groups. The hepatic concentration of triglycerides was lower in rats fed 5% COS, and fecal triglycerides significantly increased in rats fed 5% COS. These results indicate that 5% COS supplementation in a diet may exert antimicrobial activity in vivo, and inhibit the proliferation of typical gut microbes, while lowering lipids. KCI Citation Count: 0
Author 최영선(Young-Sun Choi)
김연록(Yeon-Rok Kim)
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